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OAS - Osservatorio Astronomico Sormano |
| OAS > SAEL - Small Asteroids Encounters List ( Asteroids with H > 22.0 ) |
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OAS - Osservatorio Astronomico Sormano |
| OAS > SAEL - Small Asteroids Encounters List ( Asteroids with H > 22.0 ) |
Last update: February 06, 2012
Computations by: Piero Sicoli , Francesco Manca (sormano@tin.it).
This list includes small asteroids ( H > 22 ) having an Earth MOID (Minimum Orbital Intersection Distance) distance lower than 0.015 A.U, and is a complement of the ( MBPL )Minor Body Priority List for objects of smaller size. Circumstances of the encounter with our planet are closer in time to the epoch of available observations and are reported in italic and within <angle brackets>. Moreover closest approaches for three centuries are computed only for objects having orbital elements with the uncertainty number U lower or equal to 5. For information about the U parameter adopted by the Minor Planet Center see MPC 24597 and the related page about the U value.
For the most interesting close encounters (depending on MOID, U parameter, nominal distance, propagation of the error etc.) the future minimum (min) and maximum (max) miss distances in AU are computed using the OrbFit Software Package. These values, based on a 3-sigma uncertainty confidence level, are reported at the left of the nominal result and a symbol " r " means that available radar observations have been included in the orbital solution.
For all the entries, Earth MOID (software by F. Manca , G. Matarazzo , P. Sicoli , Sormano Observatory , see internal report N.50, 1996 ) and encounter parameters (software by A. Testa , Sormano Observatory) are computed again at each orbit update.
Any comment and/or suggestion will be welcomed.
For related information, see also:
Ephemeris Service:
Close Encounters and Selected Objects lists:
Virtual Impactor:
The following service, courtesy of the Minor Planet Center, is intended as support and in addition to the objects available in the SAEL list for which follow-up or recovery is needed. The service will return all objects (NEOs and Comets) based on criteria specified by the user. Successive ephemerides of a single object found as observable and reported in the SAEL list, will be obtained using the next service in function of observatory code, time and so on.